ENGINE AR-COMPLETE 1699413 - Caterpillar

Illustration 1 g01392800
Cross Section of Final Drive
(1) Propulsion motor
(2) Hub
(3) Third stage planetary gears
(4) Third stage planetary carrier
(5) Second stage and third stage ring gears
(6) Second stage planetary gears
(7) Second stage planetary carrier
(8) First stage ring gear
(9) First stage planetary gears
(10) First stage planetary carrier
(11) Second stage sun gear
(12) First stage sun gear
(13) Third stage sun gear Each propulsion motor drives a track through a single speed planetary final drive. The right and left final drive assemblies are identical. The final drive assembly contains three planetary gear assemblies.Components inside the planetary final drive are splash lubricated. The housing serves as the oil reservoir.When the machine is moving, the output shaft of the propulsion motor turns the first stage sun gear. In the first stage planetary, the ring gear is fixed to the hub, and the planetary carrier is splined to the second stage sun gear. Therefore, rotation of the first stage sun gear causes the second stage sun gear to rotate. In the second stage planetary, the sun gear is driven and the ring gear is held. Therefore, interaction between the second stage sun gear and the second stage planetary gears cause the second stage planetary carrier to rotate. The second stage planetary carrier is connected to the third stage sun gear.In the third stage planetary, the sun gear is driven and the planetary carrier is held. Under these conditions, the planetary gears cause the third stage ring gear to rotate. The third stage ring gear is connected to the hub. The hub transfers power to the track.